package com.tencentcs.iotvideodemo.utils;

import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Environment;
import android.os.Looper;
import android.widget.Toast;

import com.tencentcs.iotvideo.BuildConfig;
import com.tencentcs.iotvideo.utils.LogUtils;

import java.io.File;
import java.io.FileOutputStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.reflect.Field;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

import androidx.annotation.NonNull;

public class CrashHandler implements Thread.UncaughtExceptionHandler {
    private static final String TAG = "CrashHandler";

    private static String mCrashPath;

    // 系统默认的UncaughtException处理类
    private Thread.UncaughtExceptionHandler mDefaultHandler;
    // CrashHandler实例
    private static CrashHandler INSTANCE = new CrashHandler();
    // 程序的Context对象
    private Context mContext;
    // 用来存储设备信息和异常信息
    private Map<String, String> infos = new HashMap<String, String>();

    // 用于格式化日期,作为日志文件名的一部分
    private SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss");

    /**
     * 保证只有一个CrashHandler实例
     */
    private CrashHandler() {
    }

    /**
     * 获取CrashHandler实例 ,单例模式
     */
    public static CrashHandler getInstance() {
        return INSTANCE;
    }

    /**
     * 初始化
     *
     * @param context
     */
    public void init(Context context, String path) {
        LogUtils.i(TAG, "init path = " + path);
        mContext = context;
        mCrashPath = path;
        // 获取系统默认的UncaughtException处理器
        mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();
        // 设置该CrashHandler为程序的默认处理器
        Thread.setDefaultUncaughtExceptionHandler(this);
    }

    @Override
    public void uncaughtException(@NonNull Thread thread, @NonNull Throwable throwable) {
        if (!handleException(throwable) && mDefaultHandler != null) {
            // 如果用户没有处理则让系统默认的异常处理器来处理
            mDefaultHandler.uncaughtException(thread, throwable);
        } else {
            try {
                Thread.sleep(2000);
            } catch (InterruptedException e) {
                LogUtils.e(TAG, "app error : ", e);
            }
            // 退出程序
            android.os.Process.killProcess(android.os.Process.myPid());
            System.exit(1);
        }
    }

    /**
     * 自定义错误处理,收集错误信息 发送错误报告等操作均在此完成.
     *
     * @param ex
     * @return true:如果处理了该异常信息;否则返回false.
     */
    private boolean handleException(Throwable ex) {
        if (ex == null) {
            return false;
        }
        // 使用Toast来显示异常信息
        new Thread() {
            @Override
            public void run() {
                Looper.prepare();
                Toast.makeText(mContext, "app error " + ex.toString(), Toast.LENGTH_LONG).show();
                Looper.loop();
            }
        }.start();
        // 收集设备参数信息
        collectDeviceInfo(mContext);
        // 保存日志文件
        saveCrashInfo2File(ex);
        LogUtils.e(TAG, "app error " + ex.toString());
        return true;
    }

    /**
     * 收集设备参数信息
     *
     * @param ctx
     */
    private void collectDeviceInfo(Context ctx) {
        try {
            PackageManager pm = ctx.getPackageManager();
            PackageInfo pi = pm.getPackageInfo(ctx.getPackageName(),
                    PackageManager.GET_ACTIVITIES);
            if (pi != null) {
                String versionName = pi.versionName == null ? "null"
                        : pi.versionName;
                String versionCode = pi.versionCode + "";
                infos.put("versionName", versionName);
                infos.put("versionCode", versionCode);
            }
        } catch (PackageManager.NameNotFoundException e) {
            LogUtils.e(TAG, "an error occur when collect package info", e);
        }
        Field[] fields = Build.class.getDeclaredFields();
        for (Field field : fields) {
            try {
                field.setAccessible(true);
                infos.put(field.getName(), field.get(null).toString());
                LogUtils.d(TAG, field.getName() + " : " + field.get(null));
            } catch (Exception e) {
                LogUtils.e(TAG, "an error occur when collect crash info", e);
            }
        }
    }

    private void saveCrashInfo2File(Throwable ex) {

        String versionName = "";
        StringBuilder sb = new StringBuilder();
        sb.append("VERSION=" + BuildConfig.VERSION_NAME + "\n");
        for (Map.Entry<String, String> entry : infos.entrySet()) {
            String key = entry.getKey();
            String value = entry.getValue();
            if (key.equals("versionName")) {
                versionName = entry.getValue();
            }
            sb.append(key).append("=").append(value).append("\n");
        }
        sb.append("ERROR=");

        Writer writer = new StringWriter();
        PrintWriter printWriter = new PrintWriter(writer);
        ex.printStackTrace(printWriter);
        Throwable cause = ex.getCause();
        while (cause != null) {
            cause.printStackTrace(printWriter);
            cause = cause.getCause();
        }
        printWriter.close();
        String result = writer.toString();
        sb.append(result);
        try {
            String time = formatter.format(new Date());
            String fileName = versionName + "-crash-" + time + ".log";
            if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
                File dir = new File(mCrashPath);
                if (!dir.exists() && !dir.mkdirs()) {
                    LogUtils.e(TAG, "fail to create log file");
                    return;
                }
                FileOutputStream fos = new FileOutputStream(mCrashPath + File.separator + fileName);
                fos.write(sb.toString().getBytes());
                fos.close();
            }
        } catch (Exception e) {
            LogUtils.e(TAG, "an error occur while writing file...", e);
        }
    }
}
